en.wikipedia.org/wiki/Pi

The number π is a mathematical constant. Originally defined as the ratio of a circle's circumference to its diameter, it now has various equivalent definitions and appears in many formulas in all areas of mathematics and physics. It is approximately equal to 3.14159. It has been represented by the ...

www.exploratorium.edu/pi/history-of-pi

A Brief **History** of π **Pi** has been known for almost 4000 years—but even if we
calculated the number of seconds in those 4000 years and calculated **pi** to that
number of places, we would still only be approximating its actual value. Here's a
brief **history** of finding **pi**. The ancient Babylonians calculated the area of a circle
by ...

www-groups.dcs.st-and.ac.uk/history/HistTopics/Pi_through_the_ages.html

And he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it about. (I Kings 7, 23). The same verse can be found in II Chronicles 4, 2. It occurs in a list of specifications for the great temple of Solomon, built around 950 BC ...

www.piday.org/learn-about-pi

**History of Pi**. By measuring circular objects, it has always turned out that a circle
is a little more than 3 times its width around. In the Old Testament of the Bible (1
Kings 7:23), a circular pool is referred to as being 30 cubits around, and 10 cubits
across. The mathematician Archimedes used polygons with many sides to ...

gizmodo.com/a-brief-history-of-pi-1610160819

Jul 24, 2014 **...** That the ratio of the circumference of a circle to its diameter is constant has been
known to humanity since ancient times; yet, even today, despite 2000 years of
thought, theories, calculations and proofs, π's precise value remains elusive.

www.math.rutgers.edu/~cherlin/History/Papers2000/wilson.html

The **History of Pi**. David Wilson History of Mathematics Rutgers, Spring 2000.
Throughout the history of mathematics, one of the most enduring challenges has
been the calculation of the ratio between a circle's circumference and diameter,
which has come to be known by the Greek letter pi. From ancient Babylonia to the
...

www.pcworld.com/article/191389/a-brief-history-of-pi.html

Mar 13, 2013 **...** In honor of **Pi** Day, we bring you a brief **history** of everyone's favorite irrational
constant.

www.slate.com/articles/health_and_science/science/2014/03/pi_day_history_perfect_symmetry_a_mathematical_constant_wave_formulas_and.html

Mar 14, 2016 **...** You may not realize it, but **Pi** Day is a real, nationally recognized holiday. In 2014
, Joseph Mazur, author of Enlightening Symbols: A Short **History** of ...